Portable telephone apparatus



A. MICLAUSH.

PORTABLE TELEPHONE APPARATUS.

APPLICATION FILED OCT. 5.1918.

Patented Nov. 15, 1921.

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PORTABLE TELEPHONE APPARATUS.

APPLICATION FILED OCT. 5. 1918.

1,397, 1 3'7, Patented Nov. 15, 1921.

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A. MICLAUSH. PORTABLE TELEPHONE APPARATUS.

' APPLICATION FILED OCT, 5.1918.

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Patented Nov. 15, 1921;

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A. MICLAUSH.

PQRTABLETELEFHONE APPARATUS.

APPLICATION man OCT. 5, 1913.

Patented Nov. 15, 1921.

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ALEXANDER MICLAUSH, OF MATTOON, ILLINOIS.

PORTABLE 'rnrernom nrraaarus.

Specification of Lettcrs Patent.

Patented Nov. 15, 1921.

Application filed October 5, 19181 Serial No. 256,999.

T allwiaom it may concern.

Be it known that I, ALEXANDER MICLAUSH, a subject of the King of llumania, residing at Mattoom'in the county of Coles and State of Illinois, have invented certain new and useful Improvements in Portable Telephone Apparatus; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it apperpertains to make and use the same.

My present invention relates to improvements in portable telephone apparatus, and the purpose of the invention is to provide a telephone apparatus arranged to be contained within a relatively small boX, which enables such apparatus to be easily carried about; and such apparatus is for use in establishing communication at desired points on electric telephone lines or electrical signaling lines.

The invention further relates to improvements in telephone receivers and telephone transmitters which are adapted more particularly for use in a portable apparatus designed for connection in telephone or common battery lines and electric railway signalingor inductance lines.-

Furthermore, the invention aims to provide an improved box in which the several parts ofthe portable telephone apparatus are arranged and in which the transmitter is carried by parts which enable it to be normally folded on the inside of the box, but allow such transmitter, when its use is desired, to be supported at a convenient position in front of the mouth of the user, while the box is supported, for instance. by a strap slung about the shoulders.

In the accompanying drawings forming a part of this application, and in which similar reference symbols indicate corresponding parts in the several views:

Figure 1 is diagrammatic view showing the circuit system of my improved portable telephone apparatus.

Fig. 2 is a front elevational view, with the covers removed, of the box with the various parts of the apparatus shown in place therein.

Fig. 3 is a horizontal sectional view taken on the line 3-3 in Fig. 2.

Fig. 4 is a fragmentary vertical sectional view taken on the linesl in Fig. 3.

, Fig. 5 is a vertical sectional view taken on the line 55 in Fig. 2.

Fig. 6 is a horizontal sectional View taken on the line 6-6 in Fig. 2.

Fig. 7 is a fragmentary cross sectional view taken on the line 77 in Fig. 6.

Fig. 8 is a rear View "of an improved transmltter. with the rear plate removed.

Fig. -9 is a vertical sectional view through the transmitter taken on the line 9'-9 in Fig. 10.

Fig. 10 is a horizontal sectional view through the transmitter on the line 10-10 in Fig. 8.

Fig. 11 is a vertical sectional view taken,

through an improved receiver.

Fig. 12 is a vertical sectional view through the receiver taken on the line 12-12 in Fig. 11.v

Fig. 13 is a horizontal sectional view through the same receiver taken on the line l3-18 in Fig. 11;

Fig. 14 is an elevational view of a detail; and

Fig. 15 is a fragmentary perspective view showing the invention in use as coupled to a drop line.

Referring more particularly for the present to Fig. 1 of the drawings, wherein the diagram of the circuit arrangement is illustrated, l designates the transmitter and 2 the receiver of the apparatus. The transmitter 1 is arranged in circuit with a battery or other source of current 3. The wires which place the transmitter 1 and battery 3 in circuit are indicated at 4 and 5. A switch arm 6 is adapted to normally rest against a contact point 7 and to be yieldingly urged against this contact point 7, as later explained. A back contact 8 is shown in Fig. 1 as being engaged by the switch arm 6 in its full line position. The switch arm 6 is shown connected by a lead 9 with oneside of the primary winding of an induction coil shown generally at 10.

A second switch arm 11 is shown as resting against the back contact point 12 connected to the wire 5. This switch arm 11 is also shown in dotted lines as engaging a front contact 13 connected by a wire 14 with the contact point 7 previously referred to. The switch arm 11 is normally and yieldingly held against the front contact point 13 by a spring or other means, as hereinafter more particularly described. arm 11 is connected by a lead 15 with the other side of the primary winding of said induction coil 10. The primary winding The switch above referred to is shown in this Fig. 1 as being made up in three sections 16, 17 and 18. The sections 16, 17 and 18, forming the primary winding, are each of a desired number of turns to secure the necessary inductive effect. Such sections 16, 17 and 18 are arranged coaxially and concentrically, and are each wound about the core'19 of said induction coil 10. In other words, the first section 16 of the primary winding is initially wound about the core 19, and surrounding said initial winding 16 is the intermediate section 17. The third or outer section 18 is wound concentrcally about the intermediate and innermost sections, and is, of course, of larger turns. The induction coil 10 is further made up of a secondary coil which, in accordance with my invention, preferably consists of a number of sections corresponding to the number of primary sections employed; and in the instance shown such secondary coil is composed of three such sections 20, 21 and 22.

I There is a third switch arm 23 shown in its full line position as engaging againsta back contact point 24 which is in connection, by means of a conductor 25 and a lead 26, with the upper end of the intermediate section 21 of the secondary coil. The switch arm-ea itselfis connected by a wire 27 and a lead 28 with the upper end of the innermost section 20 of said secondary winding. This contact arm 23 is adapted to swing over to the position shown in dotted lines when it will rest against a front contact point29. The normal position of this contact arm 23 isthat shown in dotted lines, and it is automatically returned to this dotted line position by a spring or other means whenever released, as will be described hereinafter. The front contact point 29 is joined by a conductor 30 with one arm of a switch, as will be referred to later.

The fourth switch arm 31 appears in dotted lines as making contact against a rear contact point 32, and further appears in dotted lines as capable of being swung over and engaging against a front contact point 33. The contact arm 31 is caused to assume the dotted line position and to yieldingly remain in said dotted line position by spring or other means whenever released. The

' back contact point 32 is connected by a wire other line wire is indicated at 41 and is conlead 42 runs to the induction coil 10 and is there placed in connection by a lead 44 with the lower end of the innermost section 20 of said secondary coil.

A fifth switch is shown as having two con tact arms 45 and 46 adapted to engage against contact points 47 and 48, respectively. The contact arm 45 is preferably of spring material so bent and arranged that when unrestrained it will seek the position shown in dotted lines, where it will open the circuit through the contact point 47. J The companion contact arm 46 is also preferably of spring material, but this contact arm 46 is so bent and arranged that when unrestrained it will seek the full line position shown, where it engages against and closes the circuit through said contact point 48. The contact arm 46 is shown as being smaller, and its spring action is weaker than the spring action of the larger contact arm 45, so that when restraint is removed from both said contact arms the larger and stronger arm 45 may be effectiveto move to its dotted line position and also carry the smaller and weaker contact arm 46 to the dotted line position out of engagement with its contact point 48. The smaller contact arm 46 carries a block 49 of some insulating material, and this block 49 affords a projection against which the larger arm 45 may abut, as shown. There is, of course, provided a device whereby the larger contact arm 45 may be moved from the dotted line position to the full line position and held. against its contact point 4'7, and when this device is put into'operation to accomplish this result the spring action of the smaller arm 46 will cause the same to move over to the full line position against itscontact point 48. The block 49 of insulating material is shown to be of such a length that the free end thereof will be separated from the larger contact arm 45, when said contact arms 45 and 46 are in their full line positions. This space compensates for any irregularities in the parts, and always insures a good contact between the smaller arm 46 and its contact stop 48.

The stop 47 is shown as joined by awire 50 with the conductor 36 and front contact point 83. The larger contact arm 45 is shown as connected by a wire 51 and a lead 52 with the lower end of the outermost section 22 of the secondary winding of the induction coil 10. The contact point 48 is shown as coupled by a wire 53 to an electrical extension 54 projecting from the lower end of the core 19 of the induction coil 10. The smaller contact arm 46 is shown as connected by a conductor 55 with the binding post 56, to which is also connected the con ductor 34 and lead At 56 is shown a second electrical extension of the core 19 of the induction coil 10.

This core 19 is a laminated core, and between the electrical extensions or arms 5A or 56 is a jumper Wire 57. A conductor 58 is shown as connected to the binding post 59 to which is also coupled the extension 56 and the jumper wire 57. The other end of this conductor 58 is coupled to a lead 60 which goes to one side of the receiver 2, as indicated at 61. The lower end of one of the coils 62 in the receiver 2, is in connection with the wire 60; while the upper end of said magnetic coil 62 is joined by a lead to a wire 64 passing to one pivoted arm 6 of a switch. The switch is composed of this pivoted arm 65 and a second companion pivoted arm 66, preferably made of some spring material which will cause the two arms to approach one another in the manner shown in full lines, in which position contact points 67 and 68 carried by said arms 65 and 66, respectively, will be brought together.

When these'contact points 67 and 68 are so brought together in the manner shown in full lines, the current will freely pass from the one arm to the other. The second arm 66 is connected by a wire 69 and a lead 70 with the upper end of a second magnetic coil in the receiver 2. The lower end of the magnetic coil 71 is connected by a conduct-or 72 with a binding post 73. A contact point 7 a is connected by a wire 75 with this binding post 73. A wire 76 is alsoconnec-ted between the binding post 73 and a second binding post 77 on the induction coil 10, to which the wire 25 and lead 26 are coupled. A contact point 78 is connected by leads 79 to a wire 80, which is also connected to the conductor 58. The contact points 74 and 78 are so disposed with relation to the contact arms 65 and 66 that when the latter are spread apart to the positions shown in dotted lines the said arms will respectively engage against and make contact with said contact points 74 and 78. The means for spreading these contact arms apart will be hereinafter more fully described. When such arms 65 and 66 are spread apart the a contact points 67 and 68 carried thereby will be separated and the circuit therethrough interrupted.

The wire 80 is connected by a lead 81 to one contact arm 82 of a switch which is also provided with a second companion contact arm 83. The two arms82 and 83 of this switch are in all substantial respects similar to the arms 65 and 66 of the switch previously described, and the action thereof is similar. The arm 82 carries a contact point adapted to close against a second contact point- 85 carried by the other arm 83. Outside contact points 86 and 87 are so arranged as to be engaged by the contact arms 82 and 83, respectively, when spread apart to the position shown in dotted lines. As previously referred to the contact arm 83 is in connection with the wire 30. The outside contact point 87 is joined by a wire 88 to the circuit wire iin which the transmitter r and battery 3 are included. At 89 is shown a wire which places the other contact point 86 in connection with the opposite side 5 of the circuit which includes said transmitter 1 and battery 3.

The action of the apparatus as shown in this circuit diagram in F 1., may be described as follows:

The user of the apparatus first makes his connections to the main line 39, 4:1, by joining the leads 38 and 4 2; this connection being made in any suitable manner, as indi cated at 4-0, 43. In order to transmit from the apparatus, the user will first operate a device, the construction and operation of which vill he hereinafter more fully described, which device will cause the switch arm 6 to move up against the back contact 8; the second switch arm 11 to move against its back contact 12; the third switch arm 23 to move against its back contact 2 the fourth switch arm 31 to move against its back contact 32; and the switch arms 45 and 46 to move respectively against their contact points 47 and 48. The apparatus is now in condition to transmit.

The current will flow from the battery 3 through the wire A and transmitter 1 to the wire 5, which will carry it to the contact point 12; and from there the current will pass into the switch arm 11, and by means of the conductor 15 b0 and through the three sections 16, 17 and 18 of the primary winding 01 the induction coil. Issuing out of the other end of the primary winding, the current will be returned through the wire 9, contacting arm 6, and contact point 8 back to the battery 3.

The current passing through the primary winding will, in the customary manner, induce a current of high voltage in the secondary coil of said induction coil.

The inductive effect thus developed in the various sections 20, 21 and 22 of the secondary winding will generate a current in the secondary circuit as follows: commencing with the line wire t]. the current will flow into the lead 42 and be carried therefrom to the lead 44 into the lower end ofthe section 20 of the secondary and through said section, passing up through the lead 28 and the conductor 27 to the third switch arm 23, to the back contact 24, conductor 25, binding post 77, lead 26, to and through the intermediate section 21 of the secondary and out therefrom through the lead 37, wires 36 and 50, contact 47, switch arm 45, conductor 51, lead 52, to and through the outermost section 22 of said secondary, lead 35, wire 34,

contact point 32, said fourth switch arm 31, and thenceto the lead 38 and through line wire 39.

Simultaneously, the jumper circuit is closed as follows: This jumper circuit divides off at the binding post 56 to the wire 55 and goes'to the contact arm 16, contact point 48, wire 53, jumper circuit 57, binding post 59, conductor 58, wire 60, to and through the magnetic coil 62 in the receiver 2 and out through the lead 63, wire 64,

' switch arm 65, contact points 67 and 68 to sition shown in Fig. 1.

the companion arm 66, and thence back to the receiver through the wire 69, lead 70, magnetic coil 71 of said receiver 2, and out from the receiver through the wire 72 to the binding post 73, and thence down through the wire 76 to the binding post 77, where said jumper circuit is connected to the sec ondary circuit. 7

As this jumper circuit passes through the receiver 2, and is included in the secondary circuit, it enables the user to hear at the same time that transmission is being carried on.

The device is used in the following manner for receiving on such inductive systems as are used, for instance, in railway signaling lines and the like. For this receiving work the device previously referred to, which operates the switches, is disengaged. therefrom so that the various switch arms 6, 11, 23, 31, 15 and A6 may be moved against their front contact points. In other words, these switch arms assume the dotted line po- The two contact arms 6 and 11, when in the dotted line position against their contact points 7 and 13, respectively, will obviously short-circuit the various coils 16, 17 and 18 of the primary winding so that this primary winding may have the effect of a condenser on the receiving circuit. The receiving circuit is as follows:

Coming in from the line wire 41 the current passes to the leads 42 and 4A, inner section 20 of the secondary winding, lead 28, wire 27, switch arm 23, contact point 29, wire 30, switch arm 83, contact points 85 and 8 1, switch arm 82, wires 81 and 60, magnetic coil 62 of the receiver 2, wire 64:, arm 65, contact points 67 and 68, contact arm 66, wire 69 to and through the other magnetic coil 71 of the receiver 2, wires 72 and 76, lead 26, intermediate coil 21 of the secondary, lead 37 wire 36, contact point 33, arm 31, lead 38, back to the other line wire 39.

It is noted that in the above circuit the two magnetic coils 62 and 71 of the receiver 2 are arranged in series, and the resistance thereof is very high. As the primary winding is short-circuited on itself, asabove explained, the passage of the recelving current to the secondary will store up energy in the primary winding, as will be readily understood, and the reaction on the secondary circuit will have the effect of reinforcing the same and clarifying the sounds to be heard through the receiver 2.

The above shows the use of the circuit arrangement in inductive systems, such as are employed in railway signaling work and the like, but for cutting in on ordinary telephone lines which employ what is known as the common battery system, the device is employed as follows:

For transmitting with common battery systems, the device which operates the switches above referred to is disengaged so that the various switch arms 6, 11, 23, 31, as and 46 may be returned to the initial position shown in dotted lines, where they entheir front contact points. In this instance the battery 3 is cut out, as the current over the line wires is sufficient. For transmitting with common battery systems the two switches at the top of Fig. 1 are arranged in the dotted line position, that is, the arms 65 66 and the arms 82 and 83 are spread apart so that they may engage their outside contact points, as appears in dotted lines.

This arrangement then places the transmitter 1 in series with the receiver 2, and

places the two receiving coils 62 and 71 of such receiver in parallel with each other, so that their resistance may be reduced to onefourth.

Under these circumstances, the transmitting circuit may be traced as follows:

Beginning with the line wire 41, the circuit will move through the leads 42 and 14:, secondary coil 20, lead 28, wire 27, switch arm 23, contact point 29, wire, 30, switch arm 83, contact point 87, wire 88 through the transmitter 1 to the wire 89, contact point 86, switch arm 82, wire 81, to a post 90, where the current divides, going through both the wire 60 and the wire 79. First following the wire 60, the current passes through the receiving coil 22 and out the wire 64 to the switch arm 65, contact point 74 and to the post 73. Now following the other division of this circuit through the wire 79, the current passes through the contact point 78, switch arm 66, wire 69 to the othe magnetic coil 71 of the receiver and from the wire 72 also to the same post 73, where the current again unites and passes down the common wire 76 to the lead 26 and secondary coil 21, lead 37, wire 36, contact point 33, switch arm 31, and lead 38 to the other line wire 39. As will be obvious the inclusion of the transmitter and receiver in the circuit just explained will enable the user to both transmit and receive when the apparatus is in this condition.

Referring now more particularly to Figs. 2 to 7 inclusive, a box 91 is shown, in which to receive the various parts of the switches apparatus. This box. 91 is equipped with a strap 92, secured at one end 93 to one side of the box and being engaged through a buckle 94. at the opposite side oi the box. The free end of this strap 92 may be slid through the buckle 94 to any desired position, and the strap provides a convenient means whereby the box 91 may be slung over the shoulder or otherwise carried about.

The box 91.is shown divided by a hori- Zontal partition 95 into an upper compartment 96, adapted to contain the receiver 2 and transmitter 1, and two lower compartments 97 and 98. The latter compartments 97 and 98 are separated by a partition 99. The compartment 98 serves to hold the battery 3, which may be a dry cell.

100 and 101 indicate contact plates which may receive the terminals of the'cell when pushed into place in the compartment 98.

The other lower compartment 99 receives the induction coil 10, and the various above described. The various switches 6, 11, 23, 31, 15 and 16 are all connected together so that they may be simultaneously operated.

A bar of insulation 102 is shown in Figs. 2 and 5 for so connecting all these switch arms, and as shown in F 2 these various switch arms are made of spring material and are so bent that they have a tendency to move to the right against their front contact points. The device previously described for operating these switches is in the present instance shown to be an arm 103 having a pin 1041 arranged to strike against the insulating bar 102 and move all the switches simultaneously to the left, speaking with reference to Fig. 2. The arm 103 is carried by a pin 105 projecting through the partition 95. The upper end of this pin 105 is connected to a lever 106, which provides for the operation of said arm and pin. This lever 106 preferably has a hinged extension 107, which normally folds within the upper compartment of the box, as shown in Fig. 5, but when the box is opened this hinged extension 107 may be folded out to the position shown in Fig. 3, where it is easily grasped and operated.

In Figs. 3, 4 and 6, the various switch arms 65, 66 and 82, 83 are shown as being of spring material so bent that their interior contact points are normally engaged. These contact points are formed with curved portions 108 and 109, and in such curved portionsthe ends are flared outwardly as at 110 and 111. A pin 112 of some insulating material extends across the flared ends of all of these switch arms, as shown in the figures referred to. This pin is adapted to move to the left and to enter the space between the curved portions 108 and 109 of the contact arms, in which position it will spread these contact arms apart and hold them apart in contact with their outer contact points. The pin 112 is carried by a bar mounted on the arm 103', and this tail piece 117 engages said end of the bar 113 and shifts the same to the right when the lever 106 is swung from the full line position shown in Fig. to the dotted line position shown in the same figure.

This arrangement enables, the restoration or" the switch arms 65, 66 and 82, 83 to the initial position without separately moving the arm 115. f

The compartment96 of the box 91 is provided with a cover 118 hinged at its upper end, as indicated at 119, by means of spring hinges which cause the cover 118 to swing upwardly to asubstantially vertical position above the box, when said cover 118 is rel ased. A catch 120 of any suitable character is employed to keep the cover 118 normally in the closed position shown in Fig. 5.

flap 121 is mounted on the interior of the cover 118and carries the transmitter 1. This flag 121 is also provided with spring hinges 112 which cause the same to swing outwardly thereabout when released. The flap 121 is normally kept in the position shown in Fig. 5 by a latch 123., engaging with a latch plate 124 on said flap 121. A spring 125 yieldingly presses the latch forward and a button 126 is provided, whereby the latch may be retracted out of engagement with the latch plate 124. The open position of the box is shown in Fig.15, after the cover 118 and flap 120 have beenreleased By slinging the, box over the shoulder in the manner shown in Fig. 15, the transmitter 1 is held elevated at a position in front of the mouth of the user so as to leave his hands free for other work.

As shown in Fig. 2, the receiver 2 is also adapted to be carried in the upper compartment 96 of the box 91, and this receiver is, of course, taken out when the device is put in use and may be provided with the spring head gear 127, for holding said receiver at the ear of the user without employing his hands for this purpose.

In Figs.- 11 and 1 1, I have shown a yoke 128 carried by the head gear 127, and having the free ends thereof perforated to receive screws 129 and 130 whichv swivelly support the receiver casing. The upper end of this yoke 128, is secured to a block 131, which block is connected by a pin 132 to a second block 133 Sn ported intermediately by the head gear 12. The pin 132 provides for a horizontally swiveling movement of the block 131 and receiver, and the purpose of this arrangement is to allow the receiver to be accommodated to the ears of various listeners and also to allow the receiver to be brought to such position with reference to the ear that ventilation may be had thereto.

Now referring to Figs. 8, 9 and 10, in which the improved transmitter is shown, 134 designates the transmitter box, closed by a back plate 135, and 136 designates the mouth piece carried by the box. At 137 the diaphragm is shown, and in this-instance the edges of the diaphragm are supported on a ring of insulating material 138. The peripheral edge of the diaphragm 137 is yieldingly pressed against this ring 138 by a series of bowed springs 139. These springs are connected at the rear to a ring 140 of conducting material. Screws 141 connect these springs 139 to said conducting ring 141 and connect both the springs and ring 140to a ring 141 of non-conducting material. At the front of this non-conducting ring 141 is wound a magnetic coil 142, immediately in rear of the diaphragm 137, and adapted to influence the latter as will be hereinafter explained.

The carbon particles are indicated at 143 and they are rearranged to vary the resistance in the usual manner by a disk 144 connected to the diaphragm 137.

The circuit through the transmitter enters through the binding post 145, as shown in Fig. 9. and first circulates through the magnetic coil 142, after which it passes to the ring 140 and from there through the various springs 139 to the diaphragm 137, and from there to the disk 144 and through the carbon particles 143 and thence out to line. The voice waves will actuate the diaphragm 137 in the usual manner.

In addition to this, the current flowing through the magnetic coil 142, which current will be varied in accordance with the voice waves, will also magnetically influence the diaphragm 137 and. tend to increase the amplitude of the same and increase the vibration thereof. In addition to this maneti'c action the bowed springs 139 will also tend to keep the diaphragm 137 in vibration and will tend to increase this vibration whenever. the voice waves enter through the mouth piece 136. The combined action on the diaphragm will produce disturbances in the microphonic particles 143 and will eifect their rearrangement and cause variations in the circuit, which will produce the desired result in the receiver.

Referring more particularly now to Figs.

'11, 12 and 13, I prefer to employ the receiver therein'shown, in which the coils 62 and 71 previously referred to in the description of Fig. 1 arearranged with their corQS V y close to the diaphragm 146. The action between the coils and diaphragm is the action of the magnetophone, and the two coils are connected so that they may be included in series or mu inle as previously described.

In F 11, 14: and 148 designate permanent magnets in the gaps in which are located said coils 62 and 71; The connecting wires to these coils are also shown in Fig. 11, and are numbered as abdve described in connection with the showing of Fig. 1.

The opposite ends of the coil 71 are connected to posts 149 and 150 which are in electrical connection with the other binding 1 posts 151 and 152 to which the wires and 72 are connected. In line 1 the opposite ends of the coils 62 are connected to posts 1533 and '4 which are also in electrical connecticn with the posts 155 and 156, to which the wires 60 and 63 are connected. The action of the receiveris as described above, the connections permitting of the coils 62 and 71. being connected either in series or in parallel. with the results above described.

In use an apparatus constructed in accordance with my invention may be operated in conjunction with despatchers lines indicated at 157 in Fig. I prefer to provide drop lines as shown in Fig. 15 from the despatchers lines 157 and such drop lines may be provided at suitable intervals along, for instance, railway lines. The drop line shown in Fig. 15 is composed of the two circuit wires 153 and 159, passing down from the despatchers lines 157 to a box 160 secured at arsuitablc elevation on the telegraph pole 161. Trainmen are provided with keys, by means of which they may open the doors of boxes 160 along the line, and in these boxes will be arranged terminals 162 and 163 which provide for the attachment of the leads 38 and 42 of the apparatus.

When connected in the manner shown in Fig. 15, trainmen may quickly get into communication with despatchers and either give or receive information respecting the operation or delay of trains, and by the use of the invention much confusion now experienced may be avoided.

The invention is also useful in connection with army observation work, and forms a compact apparatus which may be carried about by scouts, or observers and readily connected at various points along the lines, and through which 'Inilitary information may be transmitted to headquarters in the rear.

Having thus described my invention what I claim and desire to secure by Letters Patent of the United States is 1. In a telephone apparatus. the'combination of a transmitter a receiver having a plurality of magnetic coils, an induction,

coil, a primary circuit including said mittcr and the primary of said induction coil, a secondary circuit including the secondary of said induction coil, switch means whereby the receiver may be connected in the secondary circuit, and other switch means whereby the magnetic coils of the receiver may be connected either in series or in parallel, said last named means also adapted to connect said. transmitter in series with said receiver, substantially as described.

2. In a telephone apparatus, the combination of a transmitter, a receiver, an induction coil, a primary circuit including said transmitter and the primary of said coil, secondary circuit including the secondary of said coil, leads whereby the secondary circuit may be connected to an electrical transmission line, a pair of switch arms, opposingcontact points for said switch arms, said primary circuit adapted to be closed when the switch arms rest against certain of said contact points, the primary adapted to be short circuited on itself when the switch arms rest against the other of. saiu contact points, and other switch means whereby the telephone receiver may be connected in the secondary circuit, substantially as described.

3. In a telephone apparatus, the combina tion of a transmitter, a receiver, an induction coil, a primary circuit including said transmitter and the primary of said induction coil, switch means Jadapted to close said primary circuit, said switch means adapted also to normally short circuit said primary coil, a secondary circuit including the secondary coil, other switch means for placing said receiverinthe secondary circuit, said receiver having a plurality of magnetic coils, means whereby said magnetic coils may be placed either in series or in parallel, said last named means adapted also to place the transmitter in series with said receiver, and a jumper circuit includ ing said receiver when transmitting, substantially as described.

4. In a portable telephone apparatus, the combination of a box, a transmitter carried by said box, a receiver also adapted to be contained within said box, said receiver having a plurality of magnetic coils therein, an induction coil in said box, said induction coil having a primary composed of a plurality of sections wound one within the other, and a secondary also composed of sections wound about the sections of said primary,'a primary circuit including said transmitter and primary coil, a secondary circuit including the sections of said secondary coil, leads whereby the secondary may be connected to an electrical transmission line, switch means whereby the receiver may be connected in the secondary circuit, other switch means whereby the magnetic coils of the receiver may be connected either in series or in parallel, said last named means also adapted to connect said transmitter in series with said receiver, substantially as described.

5. In a portable telephone apparatus, the combination of a box, a hinged cover for said box, means for causing the cover to open, latch means for keeping the cover closed, a transmitter hinged on said cover, means for causing the'transmitter to swing about its hinges, means for normally keeping the transmitter close against the inside of said cover, a receiver also adapted to be placed in saidbox, an induction coil carried by said box, a primary circuit including said transmitter and the primary of said induction coil, a secondary circuit including the secondary Winding of said induction coil, switch means whereby the receiver may be connected in said secondary circuit, and means whereby the secondary circuit may be connected to an electrical distribution line,

substantially as described.

6. In a portable telephone apparatus, the combination of a box, a hinged cover for the box, means for causing the cover to open, a latch for keeping the cover closed, a flap hinged to :thecover, means for causing the flap to swing about its hinges, a latch for keeping the flap against the inside of said cover, a transmitter carried by said flap, means to support the box, a receiver also adapted to be carried in the box, an induction coil carried in the box, a primary circuit including the induction coil and said transmitter, secondary circuit also including the induction coil, switch means where by said receiver may be connected in the secondary circuit, andleads whereby the secondary circuit may be connected to an electrical transmission line, substantially as described.

7. In a portable telephone apparatus, the combination of a box, a transmitter carried by said box, a receiver also adapted to be supported by said box, an induction coil carried by said box, a primary circuit including said transmitter and the primary of said coil, a secondary circuit including the secondary of said coil, leads whereby the secondary circuit may be connected to an elec trical transmission line, a pair of switch arms, opposing contact points for said switch arms, said primary circuit adapted to be closed when the switch arms rest against certain of said contact points, the primary adapted to be short circuited on itself when the switch arms rest against the other of said contact points, means whereby said switch arms may be operated simultaneously, and other switch means whereby the telephone receiver may be connected in the secondary circuit, substantially as described.

8. In a portable telephone apparatus, the combination of a box, a transmitter carried by said box, a receiver also adapted to be carried by said box, an induction coil carried by said box, a primary circuit including said transmitter and the primar T of said induction coil, switch arms adapted to close said primary circuit, said switch arms ada ited also to normally short circuit said primary coil, means for simultaneously moving said switch arms to place the primary coil in said primary circuit, a secondary circuit including the secondary coil, switch means for placing said receiver in the secondary circuit, said receiver having a plurality of magnetic coils, means whereby said magnetic coils may be placed either in series or in parallel, said last named means adapted also to place the transmitter in series with said receiver, and a jumper circuit including said receiver when receiving, substantially as described.

9. In a portable telephone apparatus, the combination of a box, a transmitter carried by the box, a receiver also carried by said box, an induction coil carried by said box, a primary circuit including said transmitter and the primary of said induction coil, a secondary circuit including the secondary of said coil, switch means whereby the receiver may be placed in said secondary circuit, said receiver having a plurality of magnetic coils, and switch means whereby said magnetic coils may be placed either in series or in parallel and whereby the transmitter may be included in series with said receiver, said means including a pair of switches having interior and exterior contact points, said switches each including arms arranged to normally close together to bring said interior contact points together, and means whereby said arms may be spread apart to close the outside contact points, substantially as described.

10. In a portable telephone apparatus, the combination of a box, a transmitter carried by the box, a receiver also adapted to be contained within the box, an induction coil also carried by said box, a primary circuit including said transmitter and the primary of said induction coil, a secondary circuit including the secondary of said induction coil, switch means whereby the primary circuit may be closed at one time and also whereby the primary winding of said induction coil may be short circuited at another time, other switch means whereby said receiver may be connected or disconnected from said secondary circuit, a device for actuating all of said aforementioned switch means, said receiver having a plurality of magnetic coils, switch means for connecting said magnetic coils either in series or in parallel and also whereby said transmitter may be connected in series with said receiver, said last mentioned switch means including pairs of arms, interior contact points carried by said arms and normally closed, normally open exterior contact points adapted to be closed by said arms, means whereby said arms may be spread apart, a bar carrying said means, hand actuating means for said bar, and a part on said device adapted to shift said bar to cause the release of said spring arms, substantially as described.

' ALEXANDER MICLAUSH. 

